Fix 1770: revert caused a crash in displayLilyMusic.

[lilypond.git] / scm / define-music-display-methods.scm

diff --git a/scm/define-music-display-methods.scm b/scm/define-music-display-methods.scm
index c0041ba2a98344efe4fdef5fe097a9e0f832e0cb..f58d60fa35330990983baf421b6183c9efb64de5 100644 (file)
--- a/scm/define-music-display-methods.scm
+++ b/scm/define-music-display-methods.scm
@@ -856,10 +856,8 @@ Otherwise, return #f."
 
 (define-display-method OverrideProperty (expr parser)
   (let* ((symbol         (ly:music-property expr 'symbol))
-        (property-path   (ly:music-property expr 'grob-property-path))
-        (properties      (if (pair? property-path)
-                             property-path
-                             (list (ly:music-property expr 'grob-property))))
+        (properties   (ly:music-property expr 'grob-property-path
+                                             (list (ly:music-property expr 'grob-property))))
         (value   (ly:music-property expr 'grob-value))
         (once    (ly:music-property expr 'once)))
 
@@ -879,8 +877,9 @@ Otherwise, return #f."
            (new-line->lily-string))))
 
 (define-display-method RevertProperty (expr parser)
-  (let ((symbol (ly:music-property expr 'symbol))
-       (properties (ly:music-property expr 'grob-property-path)))
+  (let* ((symbol (ly:music-property expr 'symbol))
+         (properties (ly:music-property expr 'grob-property-path
+                                             (list (ly:music-property expr 'grob-property)))))
     (format #f "\\revert ~a~a #'~a~a"
            (if (eqv? (*current-context*) 'Bottom)
                ""